|The science of managing change for filters|
|Application Note: Generic Process of Virus-Like Particle (VLP) Based Vaccine Manufacturing|
|Establishing Product Specific Bubble Point Specifications For Sterilizing-Grade Filters|
|Chemical Compatibility of Filter Components (MilliporeSigma)|
|Millidisk® Cartridges and Millipak® Disposable Capsules (MilliporeSigma)|
|Sterile and Gamma Compatible Sterilizing-grade Durapore® 0.1 μm and 0.22 μm Filters (MilliporeSigma)|
|Colony filtration blot: a new screening method for soluble protein expression in Escherichia coli|
Tobias Cornvik, Sue-Li Dahlroth, Audur Magnusdottir, Maria Dolores Herman, Rosemarie Knaust, Monica Ekberg & Pär Nordlund
Nature Methods, 2005 Jul:2(7):507-509 2005
|A functional study on polymorphism of the ATP-binding Cassette transpoter ABCG2:|
Toshihisa Ishikawa,Biochem.J, 373, 767-774, 2003, internal ref ABC-02
Biochem.J, 373, 767-774, 2003, internal ref ABC-02 2003
|Comparison of microporous membrane morphologies using confocal scanning laser microscopy|
Charcosset C (reprint), et al.
Journal of membrane science. 2000. v168, n2, p53-62 2000
|ATP/Mg2+-dependent Cardiac Transport system for Flutathione S-Conjugates|
Toshihisa Ishikawa,J.Biological Chemistry, 264:29, 17343-17348, 1989, internal ref ABC-01
J.Biological Chemistry, 264:29, 17343-17348, 1989, internal ref ABC-01 1989
|How do I tell the membrane from the separator?||The blue paper is the separator.|
|Can Millipore filters remove mycoplasma from my solution?||Mycoplasma can be removed from solutions by using a 0.1 um pore size filter. For mycoplasma reduction the 0.1 um Durapore filter can be used. Its Millipore code is VV. A 0.1 um Express membrane can also be used for removal of mycoplasma. Its membrane code is VP. These membranes are available in a number of fabricated fiter devices. For help determining which device would be best for your solution, call Millipore Technical Services.|
|I would like to use the Durapore membrane discs and am interested in knowing what is meant by average pore size?||Since the size and uniformity of the Durapore membrane is accurately controlled during manufacturing, it is possible to rate membranes as absolute filters based on the largest particle that can pass through the membrane. It is then possible to confirm the pore size rating of the membrane filter using a non-destructive integrity test referred to as the bubble point test. This test is based on the fact that liquid is held in the membrane pores by surface tension and that the minimum pressure required to force liquid from the capillary structure is directly related to the capillary diameter.|
|I have a dilute protein solution. I want to make sure I do not lose any of my protein. Which filter should I use?||You should use any device that contains a Durapore filter. Durapore is the lowest protein-binding filter available. This filter will give the best yield when filtering a dilute protein solution.|
|Can I autoclave my filters?||Millipore's MF, Durapore, Fluoropore and Mitex filters are all autoclavable. Standard conditions of 121-126C for 20-30 min generally work quite well. However, the filters should be autoclaved on a "slow exhaust (liquid) cycle. Because Fluoropore membranes have a polyethylene backing they will be slightly wrinkled after autoclaving.|
|How do I dissolve my Durapore membrane?||Hot DMF, DMSO, NMP will mostly dissolve hydrophobic GV & VV, but there still is an "insoluble" portion if you try to filter it. Phobic HV truely dissolves.
The hydrophilic versions can not be fully dissolved in part to the hydrophilic surface modification which is insoluble in all solvents.
We don't recommend Durapore for applications where the membrane needs to be dissolved. MCE is a great choice.
|How do I clear my Millipore filters?||It is possible to clear Millipore filters by choosing a clearing agent with the same refractive index as the membrane. This is called the PORE FILLING TECHNIQUE. Filters appear opaque because of the diffraction of light through the tortuous pores. Filling the pores with a liquid that has the same refractive index as the membrane (ex. xylene for MF filters) allows light to pass through the filter at a uniform speed thus rendering the filter transparent. This technique can be used for most membrane filters with a single refractive index. The refractive index for Durapore membrane is 1.42 and for MF membrane its 1.50.
Please note that this does not work for polycarbonate membranes because these membranes have more than one refractive index (1.62 and 1.58). If desired, the porous structure can be dissolved from Isopore polycarbonates by dissolving the filter in chloroform, methylene chloride or 1-methyl-2 pyrrolidone.
|What is the blue separation paper between my filters?||It is a parchmentalized paper specially formulated for Millipore Corporation.|
|How do I assemble a diffusion chamber containing tissue for implantation?||
|What are the dimensions and width of the grids on the Millipore 47mm gridded membranes?||The grids are 3.08mm x 3.08mm square. A grid line is 44um in width and there is are average of 169 gridded squares per filter. Please note however that the actual filtration area and therefore the total number of squares in that area is dependent on the filter holder. For filter holders with 9.6sq.cm of filtration area there are 100 squares available. For filter holders with 13.8 sq.cm of filtration area the number of available grids are approximately 140.|
|Hydrophilic Durapore® Cartridges and Capsules User Guide|